Capsaicin/pharmacology; Cerebral Cortex/cytology; Neurons/physiology; Sensory System Agents/pharmacology; Theta Rhythm/drug effects; Analysis of Variance; Animals; Animals, Newborn; Anoctamins; Biophysics; Calcium/pharmacology; Cerebral Cortex/drug effects; Cerebral Cortex/physiology; Chloride Channels; Diterpenes/pharmacology; Dose-Response Relationship, Drug; Electric Stimulation; Enzyme Inhibitors/pharmacology; Female; In Vitro Techniques; Male; Membrane Potentials/drug effects; Membrane Potentials/physiology; Microscopy, Immunoelectron; Neurons/drug effects; Neurons/ultrastructure; Patch-Clamp Techniques; Rats; Rats, Sprague-Dawley; Subcellular Fractions/metabolism; Subcellular Fractions/ultrastructure; TRPV Cation Channels/metabolism; TRPV Cation Channels/ultrastructure; Tetradecanoylphorbol Acetate/analogs & derivatives; Tetradecanoylphorbol Acetate/pharmacology; Voltage-Sensitive Dye Imaging/methods